The truly amazing thing here is how powerful the placebo control was, even despite the fact that as someone who's done ketamine IV treatment before, it's pretty obvious when you're on ketamine and when you're not.

"At week 6, remission in the ketamine arm remained high, although non-significantly versus placebo (69.5% v 56.3%; odds ratio 0.8 (95% confidence interval 0.3 to 2.5), P=0.7)."